Weighing machine



C. K. MILNE.

WEIGHING MACHINE.

APPLICATION FILED FEB.3.19zo.

1,403,704. Patented Jan. 17,1922.

Il l l l l I l PATENT oEFIcE.

CHARLES KIDNER 'lVIILN-E7 OF HAMILTON, ONTARIO, CANADA.

WEIGHING MACHINE.

Specification of Letters Iatentf Patented Jan. 17, 1922.

-pplcation led February 3, 1920. Serial No. 356,020.

T 0 all whom t may concern.'

kBe it known that I, CHARLES KIDNER MILNE, vof the .city of Hamilton, inthe county of `ljlentworth, Province of Ontario, Dominiony of Canada, have'invente'd certain new and useful Improvementsin Veighing Machines, of which the following is the specification.

lMy invention relates to improvements in weighing machines and the .object of the invention is to devise simple, compact and strong dial attachment which may be applied to any of the ordinary platform scales so that the weight on the platform may be registered on aiclockfdial; a further object is to render the connections between. the platform and the .dial entirely free from spring members; a further object Yisto provide means for obtaining in the machine any desired degree ofk sensitiveness; and a still further object is to provide such a mechanism in which any adjustment vmadewill be permanent.

lMy invention cons1sts of the construction and arrangement of parts all as moreparticularly described and illustrated in the accompanying drawing, in which:

FigureI 1 is a back view partly in section showing my invention applied to a platform scale withthe various parts in the position occupied wheny the indicating needle is at zero.

Figure 2 is a similar view showing the .parts in the position occupied when the indicating needlehasfrotated through 180 of the dial. f

Figure 3 is a general front view showing the clock dial.

Like characters of reference .indicate corresponding parts inthe different views.

1 indicates the base of the scales `and 2 the weighing platform thereof. 3 indicates a hollow upright standard connecting the base 1 to the horizontal fra-me member 4. 5 is an upright standard carried by the frame 1 and supporting the dial 6. Z is al shaft supported in bearings in the standard 5 and carrying at its forward end the indicating needle 8 and intermediately of the bearings the toothed pinion 9. These bearings may be of either the plane, ball or other type. 10'is a fulcrumed lever rotatably supported intermediately of its length by the standard 12 at the point 11. I have shown a knife edge at this point but a journal end bearing or some other suitable means of support might be used. The segmental toothed portion 13 at the inner end of the lever 10 engages the toothed pinion 9. The knife edge 14 is provided adjacent to the outer end vof the 'lever 10. 1 5 is a weight adjustably connected to the inner end of the lever 10 by means of the arms 16 and 17, thelatter Aof which is provided with a threaded portion 18. 19 is a standard carried by the frame 4. 20 is a lower lever fulcrumed adjacent to one end by the knife edge 21 engaging the upper face of the standard 19. 22 is a knife edge carried by the lever 2O adjacent to the end thereof remote from the knife edge 21. 23 and 241 are knife edges carried bythe lever 20 intermediately of the knife edges 21 and 22. 25 is a weight supported from the knife edge 23 through the links 26 and 27. The weights 15 and 25 are mutually opposed. counterbalancing weights. 28 and 29 are links connecting thelever 2O to the pl-atform 2 through the medium of the knife edge 2l. 30, v81 and 32 are links connecting the knife vedges 14k and22. The knife edge 14 and the supportingl point 11 are so arranged that when the mechanism is inthe position shown in Figure 2, that is when the needle has made half a revolution of thedial, the faces of these'knife edges and thefaxis of the shaft 9 all lie in onestraight line. Further in this position the knife edge 1&1 is vertical. The knife edges 21,22 and 24 carried by the lever 2O may be so arranged that they all lie in one straight line. The weight 15 is adjustable on the arm y17 and thaw/eight 25 ispreferably made hollow so ythat it can be readily altered by adding shot or similar material.v 38 is any suitable outercasing supported onv the frame l and adapted to enclose the cmplcte mechanism. i f f ,The operation ofmydevice is as follows:

The mechanism is first adjusted for the zero reading as yillustrated in Figure 1. This is accomplished by engaging the pinion 9 with the upper portion of the toothed segment 18 so that the indicating needle points to zero on the dial. In this position the weights 15 and-25 must be in a. state of equilibrium so that the weight 15 is freely supported.

It will now be seen that when a weight is placed upon the platform, the lever 2() is pulled downwardly through the links 28 and 29 and the knife edge 24. As a consequence, the knife edge 22 is pulled downwardly and this downward movement being carried by the links V30 and 31 and 32to the knife edge 14: causes the outer end of the lever l0V tof move downwardly and the toothed segmentalinner portion 13 to rotate upwardly about the Supporting pointV 11 and this causes the Ypinion 9 to rotate in the direc` tion indicated by the arrow and with it the K indicating needle 8. The relative length of the segmental portion 13 in respect to the circumfer'encev of the pinion 9 is such that slightly Vmore than one complete revolution of the pinion is permitted.

.made equal to twojp'ounds so `that theV capacity of the scale would be one hundred pounds. Y Y Y y' l Y.

Hitherto the pinion 9 of clock dialscales i has been operated by a straight rack,'but it fis to befnoted that'by the provision of my circularV segmental lever 10,j fulcrumed at the point 11a much greaterdegree of sensitivenessfis obtained. The reason for this being that when arack is used it must be supported in some type' of slide and. must be kept 'in engagement with the pinion by some pressure means. v'lhusthere is considerable frictionat this connection. Also the Weight of the rack itself tends to operate against the 'action of the scale. Infmy device these difficulties 'are` ,entirely eliminated as the lever l0 'being supported interrnediately of its lengththe two portions thereof can be made to lcoun'terbalance each other so that the effect of 4gravity on the lever is nil. Further as the lever' lOand the pinion 9 are rotatably'supported the radial pressure ex,- isting vatthe point of engagement therebetween is almost negligible,

vFrom the foregoing it willbe v'seen VthatI have devised a very simple, strong and compact dial attachmentwhich can befitted to any platform scale by which the capacityV of such scale can bealtered at will.

In practice the adjustment to the weights lgand 25 would be made when the scale isV capacities. It will thus be seen that I can make all the component members of my scale in large quantities and. scales of various capacities will be identical with the exception of the weightsl and25 andthe 4dial markings. JIt is ofcourse to be understood that 'l the feature above referred to appliesonly within reasonable limitsf and in making 'scales of very large capacities stronger and Y larger members must be used than wouldbe Y the case with thevsmallertype ofcounter scales.. Y p y K YWhat I claim as'my invention' is In a weighing machina/the combination with thejweightreceiving element and the Y weight registering element, vof Vaplurality of substantially parallel levers Vplacedone above the other,' the Ilowerof said levers'belng fulcrumed adjacent to one end thereof to the main frame of the machine7 connecting means whereb'ypsaid leverisactuatedby the weight receiving element, the upper of said levers being fulcrumed: intermediatelyfof its length on the mainframe of the machine,

connecting means between the free end of the lower leverland the adjacent end of the upper lever whereby "theupperlever is actuated'by the lowerllevery'a circular pinion operatlng the weight registering element,

the free end of the Vupperleverfformed into i, a circular segmental toothed portion cofacting vwith the circular of mutually weightsl carried vby the -upper landflower levers, the weight carriedby the upper lever pinion, and a system opposed counter-balancing beingacljustable whereby the sensitiveness i ofthe machine may be altered as Adesiredt` CHARLEs KIDNER MILNE. Witnessesri Y 

